android - Generated DH key is too big -


i'm trying generate dh key pair public key has 2048 bit of length, everytime it's bigger

my code is

private static biginteger g = new biginteger("1234567890"); private static biginteger p = new biginteger("2"); private int l = 2048      security.addprovider(new bouncycastleprovider());      dhparameterspec dhparams = new dhparameterspec(p, g, l);     keypairgenerator keygen = keypairgenerator.getinstance("dh", "bc");      keygen.initialize(dhparams);

it seems lparam works wrong or misunderstood , don't know how fix it. advice

i think misunderstand 'l' parameter (also 'p' , 'g'). firstly, optional, can use new dhparameterspec(p, g). secondly, when used typically shorter bit length of 'p' (which supposed prime modulus, not "2"), e.g. in rfc 7919, appendix a.1. specifies 2048-bit modulus 'p' , generator 'g' = "2", suggested minimum 'l' value 225. means considered secure choose secret exponent (private key) 225 bits long, speeds key generation , dh operations significantly.

i recommend use parameter set rfc 7919.


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